You failed to mention a key information. Dell XPS 13 2-in-1 is basically powered by Core M and that is the only reason why they could make it thinner and fanless. Starting with Kaby Lake Intel renamed Core M5 and Core M7 as Core i5 /i7 respectively. They can be differentiated of course by the model number that contains letter Y in them, just like in Core M3.﻿